Rectangular sink



FIG. 1 is a top perspective view of a rectangular sink embodying my new design;

FIG. 2 is a left side plan view thereof; the right side being an identical image thereto;

FIG. 3 is a front plan view thereof, the rear plan view thereof being identical thereto;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines shown in the drawings represent a hole in the sink and form no part of the claimed design. 

CLAIM The ornamental design for a rectangular sink, as shown and described. 